From owner-freebsd-hackers  Tue Mar  5  7:24:36 2002
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Date: Tue, 5 Mar 2002 10:24:23 -0500
From: Leo Bicknell <bicknell@ufp.org>
To: Paul Halliday <dp@penix.org>
Cc: Patrick Thomas <root@utility.clubscholarship.com>,
	freebsd-questions@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG
Subject: Re: cannot get more than 32 PTYs in 4.4-RELEASE
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In a message written on Tue, Mar 05, 2002 at 07:52:09AM -0600, Paul Halliday wrote:
> pty*)
>         class=`expr $i : 'pty\(.*\)'`
>         case $class in
>         0) offset=0 name=p;;
>         1) offset=32 name=q;;
>         2) offset=64 name=r;;
>         3) offset=96 name=s;;
> 
> interestingly enough the command "./MAKEDEV pty3" will create (as
> indicated) heh.. I was assuming too much, something is screwy here.
> 
> *confused*
> 
> it actually only created 64 terminals. Added the line:
> 
> 4) offset=192 name=t;;
> 
> ~# ./MAKEDEV pty4 && kill -HUP 1
> 
> interesting, now I have 96, but can only use 64. Reboot..

I think if you look at a more recent MAKEDEV, you'll find your answer:

pty*)
        class=`expr $i : 'pty\(.*\)'`
        case $class in
        0) offset=0 name=p;;
        1) offset=32 name=q;;
        2) offset=64 name=r;;
        3) offset=96 name=s;;
# Note that xterm (at least) only look at p-s.
        4) offset=128 name=P;;
        5) offset=160 name=Q;;
        6) offset=192 name=R;;
        7) offset=224 name=S;;
        # This still leaves [tuTU].

So:

sh MAKEDEV pty0   # 0-31
sh MAKEDEV pty1   # 32-63
sh MAKEDEV pty2   # 64-95
sh MAKEDEV pty3   # 96-127
sh MAKEDEV pty4   # 128-159 xterm won't recognize by default
sh MAKEDEV pty5   # 160-191 xterm won't recognize by default
sh MAKEDEV pty6   # 192-223 xterm won't recognize by default
sh MAKEDEV pty7   # 224-255 xterm won't recognize by default

It's fairly trival to patch xterm to look for additional letters.  It
may have made it in the XFree source already.  *shrug*

-- 
       Leo Bicknell - bicknell@ufp.org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/
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